Will CNNs kill CAPTCHAs or can they survive in an evolved form?
I think that captchas can be substituted or augmented by questions which require understanding of context, for example:



How many hands keep the rose?

Or



Which number of books under the bench and in hands?

These examples are simple, but they can be improved, for example, by generation of images with random  numbers of objects and their positions

It looks like it will be hard to use CNN to hack such kind of captchas, especially if we have a large amount of different objects and their combinations

In addition, it can be improved by adding more complicated logical questions to compositions on pictures